Compound grinding-head for grinding two cylindrical machine parts at the same time



T. F. BERNARD.

COMPOUND GRINDING HEAD FOR GRINDING TWO CYLINDRICAL MACHINE PARTS AT THE SAME TIME.

APPLICATION FILED MAY 17, I920- Patehted Nov. 1, 1921.

4 SHEETS-SHEET I.

WITNESSES: LIiVENTOR.

8% -fr @wm/d M T. F. BERNARD. COMPOUND GRINDING HEAD FOR GRINDING TWO CYLINDRICAL MACHINE PARTS AT THE SAME TIME.

APPLICATION FILED MAY I7, I920- Patented Nov. 1, 1921.

4 SHEETSSHEET 2- INVENTOR f mm/ A ORNEY. I

WITNESSES: W 71 F T. F. BERNARD. COMPOUND GRINDING HEAD FOB GRINDING TWO CYLINDRICAL MACHINE PARTS AT THE SAMETIME.

APPLICATION FILED MAY|7,1920- 1,5. 95i' ,790. Patented Nov. 1, 1921..v

4 SHEET$-$HEET 3- INVENTOR. 1

TTORNEY.

- WITNESSES? T. F. BERNARD. COMPOUND GRINDING HEAD FOR GRINDING TWO CYLINDRICA-L MACHINE PARTS AT THE SAME TIME.

APPLICATION FILED MAY 17, 1920- 1,395,790, Patented Nov. 1, 1921.

4 SHEETSSHEET 4.

INVENTOR.

Z 1 .7, hand y v v XTTORNEY WITNESSES:

W 77 FM omrso STATES PATENT OFFICE;-

THEIS F. BERNARD, 033 DETROIT, MICHIGAN, ASSIGNOR TO FREDERICK M. EHEHALT,

' OF DETROIT, MICHIGAN.

GOMPOUN D GRINDING-HEAD FOR GRINDING TWO CYLINDRICAL MACHINE PARTS .AT

Y THE SAME TIME. I

To all whom it may concern Be it known that I, THEIS. F. BERNARD, a

' lowing to be a full, clear, and exact descripafterdescribed.

tion of the'same, such as will enable others skilled in the art to whichit pertains to make and use the same, reference being made to the accompanying drawings, which form a part of these specifications.

The objects of my invention are to provide means for adjusting'and alining the double grinding. spindles inthe grinding head, so both are in the same plane with respect to the axisof the grinding wheel, and to pro vide a perfect alinement of theupper' spin.- dle with the axis of the lower spindle, and mechanical means for making these adjustments. i

It is fa further object of my invention to secure a rigidconstruction of the grinding head with accurate means for adjustment,

and simple means for operating the parts.

These several objects are secured in the preferred form by the construction and arrange-' ment of the parts, as are more fully here- Similarparts on all drawings are marked bysimilar numerals.

Figure 1, is a front view of the grinding machine showing the general arrangement of the working parts, supporting and operating the double grinding spindles.

Fig. 2, shows'a top view of the grinder with the adjusting mechanism for bringing the spindles in alinement with the axis of the grinding wheel.

Fig. 3, is an end view showing the drive gears and means for the horizontal adjustment of the spindles.

Fig. 4:, is a sectional view on the line --AA, on Fig. 1, showing in detail, the means for both the vertical and horizontal adjustment of the head stock spindles.

Fig. 5, is a sectional view taken on line BB, on Fig. 1, showing the means for both the vertical andhorizonta'l adjustment of'the tail stockspindles.

Specification of Letters Patent.

Application filed May 17, 1920. Serial No. 382,190.

Fig. 6, is a sectional view on line -CC.,

Fig. 3, showing. the arrangement, adjustment and operation of thespindles relative to the axis, of the grinding wheel. I will now describe more fully the work- 1ng parts, and the construction thereof, referring to the accompanying drawings and the marks thereon.

The grinding head is mounted on a swiveled base plate 1, securely fastened to the horizontally moving table 2. The carriage is supported by the main base casting 3, and held in place by the grooved slides which allow a free, but rigid, horizontal movement of the table. On the bottom of the carriage base'2, is a rack 4 engaging the pinion 5. Pinion 5 is operated by the hand wheel 6 on the front of-the grinder base, giving the table its horizontal movement in a plane parallel to the axis of the grinding wheel, and

carrying the work pieces across the surface of j the grinder. At the ends of the base plate 1, are the solid hori'zontal'support blocks 7 and 8 rigidly attached thereto, but can be ad justed thereon, so as to care for the differ ent lengths of workpiecesheld in the grindgles to the axis of the grinding wheel.

Mounted on the support block 7, and attached thereto by means of bevel sliding clamps, is the vertical support block 9. By means of a screw adjusting shaft 10, mounted in the horizontal'block 7, and connected to block 9 by meansof a threaded nut onthe bottom thereof, the vertical block 9'can "be moved in a horizontal plane at right an? gles to the axis of the grinding wheel, thus giving the spindles in the headstock the proper adjustment to bring the work pieces in contact with the surface of the grinding wheel. The adjusting shaft 10 is rotated by means of gear 11 mounted thereon, and meshing with gear 12. Gear 12 is mounted on, and driven by shaft 13 and hand wheel 14.

Mounted on the vertical support block 9, i

by means ,of bevel ,sliding clamps, is the solid double spindle head 15. 'Bymeans of the screw adjusting shaft 16 mounted in the 7 grinding spindles, both work pieceswill be ground the same size, but by'raising or lowering the spindle blocks, oneof the spindle centers will be placed farther from the surface of the grinding'wheel, thus makingthe work on that spindle'of a larger diameter.

' The adjusting screw 16 is rotated bytgear 17 mounted thereon and which meshes with gear 18. Gear 18 is mounted on and is rotated by shaft 19, and hand wheel 20. The spindle block ocarries mounted therein, the adjustable sleeve bearings 21, which fit tight but with a horizontal adjustment of the spindles by means of the threaded lock vnuts 22 at each end thereof; Inside the sleeve bearing 21, and rotating therein, are the drive spindles 23 and 24. At the outer end ofthe spindles 23 and 24, and securely fastened .thereto, are the drive gears 25 and 26. ;Both thegears 25 and 26 mesh with a common drive gear 27, which is driven by a power pulley 28; On the inner end of the,

spindles 23 and24, and mounted therein, are. the center-points 29, which support the work pieces. Also mounted on the inner. end of the spindles ,23- and 24, and rotating therewitlnare the face plates 30 for driving the workpieces by means of the dogs. 31 connecting therewith. Artthe tail end of .the base plate 1, andmountedon the horizontal support'block 8, is the vertical support block 32. Block 32 is connected to block 8 vbymeans of, bevel. sliding clamps which allow it to slide in a horizontal direction on block 8.

' Adjusting screw 33 ismounted in block 8,

and connected to block .by means ofa threaded nut at the bottom. ,Any turning of thescrew 33 will move the block 32 in a' horizontal direction on the slide. Shaft 33 is rotated by gear 34 mountedthereon. Gear 34 meshes with gear 35, which is mounted on a loose collar 36, and rotates freely on shaft At the outer end of collar 36 are teeth- WhlOltQIlgQQG 1n-collar'37. The collar 371s: splined to shaft 13 by means of a key, and

maybe adjusted thereon as the tail stock is adjusted to the various length .of the work pieces held for grinding. When the teeth on thegcollars 36 and37 are engaged, the screw shaft- 33 is rotated by the turning of theyshaft 13 and the handwheel 14. The shaft 13v being connected through the gears and the screw adjusting shafts,-to both the head and .tail stocks, provide a simultaneous point from the work pieces; I

I do not wi h to confine myself to'the exand uniform adjustment in the horizontal plane, for the grinding spindles. provides an accurate means for moving the work to and 'from the grinding wheel. If a closer adjustment is needed to bring the axis of the spindles in the proper-plane relative to the axis of the grinding wheel,

It also the teeth on the collar 37 may be disengaged from the collar 36 by sliding on the key,

allowing a free movement of collar 36, and.

gear 34, independent of the shaft, causing the proper adjustment of the support block 32, and bringing the spindles in line. Mounted on block 32 by means of sliding bevel clamps, is a single spindle bearing 38. bcrew shaft 39 is mounted in block32 and is rotated by gear 40 mounted thereon.v Gear 40 meshes with gear 41. Gear 41 is splined to the shaft 19 by means of a sliding key to allow for the adjustment of the tail stock.

Shaft 19 being connected directly tot-he spindle bearing blocks on both the head and tail stocks, by means of gears and the adjusting shafts, provide a simultaneous and uniform adjustment of the spindles a vertical plane, for raising-and loweringthe spindles to the desired position relative to the grinding wheel. Mounted on the spindle bearing block 38, by means ofbevel sliding clamps, is a secondaryadjustable bearing block 42 for the upper tailspindle.

Block 42 is held in position by means of set screws 43 and 44, any adjustment of which causes a movement of the block in a hori-o zontal plane, and providesmeans for bring ing the axis v of the upper spindle true alinement with thatxof the lower spindle,

to avoid taperin either the upper or lower work piece. Both the'bearing blocks 38-,and' 1 42, carry a support sleeve 45 which slides endwise in thebearing. Sleeves 45 carry at the "inner end a tail center point 46, to support the turning work pieces. Inside of I sleeve 45 is a support coil spring 47, heldfin place by a stationary block 48.. Block 48 is held in position by a pin passingthrough the slots in the sleeve 45 and into thejmain bearing blocks 38 and 42. At the outer end of the bearingblocks 38'and 42,]arethe re I V lease levers 49 and50, which engage a. notch atthe end of sleeve'45. Lever 50 is connected with the foot lever 51 by means of a rod 52. Any pressure downward'of' the foot; lever 51, will rock the arm 49 and draw the sleeve 45 back and release the tail center, f

act construction asherein described, but

-merely give this as a preferred form of co nstruction.

Having fully described my invention here-' in, whatI claim asmyzinventionand desire I to secure by Letters Patent is j v, A compound grinding head with two pairs of work supporting spindles for holding and grinding two cylindrical machine parts at the same time, in combination with the horizontal table of the grinding machine, and the rotating grinding wheel positioned so as to simultaneously act on both the work pieces, a head stock, and a tail stock to support the spindles, a horizontal sliding plane splined to the spindle supports, a screw for making a horizontal adjustment of the same to bring the work to and from the grinding wheel.

2. A compound grinding head with two pairs of work supporting spindles, in combination with the horizontal tableof the grinding machine, and the rotating grinding wheel mounted thereon, positioned so as to simultaneously act on both the work pieces, a head and tail stock to support the spindles, a horizontal sliding plane splined to the spindle blocks, a screw for making a horizontal adjustment of the same, a vertical sliding plane splined to the spindle blocks, and a screw for making the vertical adjustment of the spindles so as to adjust both work pieces to the surface of the grinding wheel to grind pieces of the same diameter or of different diameters.

3. A compound grinding head with two pairs of work supporting spindles, in combination with the horizontal table of the grinding machine, and the rotating grinding wheel mounted thereon and positioned so as to simultaneously act on both work pieces, a head stock and tail stock to support the spindles, means for making the horizontal adjustment of the double spindle bearings, means for making the vertical adiustment of the double spindle bearings, and means for a secondary adjustment for one of the tail spindles so as to bring both spindles in perfect alinement.

4. A compound grinding head with double work supporting spindles, a head and tail stock, in combination with the horizontal table of the grinding machine and the rotating grinding wheel mounted thereon, abase plate with horizontal slide supports mounted on either end, the head and tail stock slid-' ing thereon, means for clamping the same to the slides, a screw adjusting shaft with gear attached, an adjusting drive shaft with gears mounted thereon and meshing with gears on the screw adjusting shafts and means for operating the same.

5. A compound grinding head comprising two work supporting spindles, a head and tail stock. in combination with the horizontal table of the grinding machine and the rotating grinding wheel mounted thereon, a horizontal slide support for the head stock, a vertical slide support mounted thereon, means for clamping same thereto, means for adjusting same in a horizontal plane, a doumeans for adjusting spindle bearing in a vertical direction.

6. A compound grinding head with two worksupporting spindles, a head and tail stock, in combination with the horizontal table of the grinding machine and the rotating. grinding wheel mounted thereon, means for adjusting the head stock in a horizontal plane at right angles to the axis of the grind ing wheel, a double hearing block with means for clamping same to the vertical slide support, a screw adjusting shaft, and means for operating said adjustment in a vertical plane.

7 A compound grinding head with douhle work supporting spindles in combination with the workingtable of the grinding machine and the rotating grinding wheel mounted thereon, a horizontal slide support for the tail stock, a vertical slide support mounted thereon, means for clamping same, means for adjusting same in a horizontal plane and'at right angles to the axis of the grinding wheel, a single spindle bearing block mounted thereon, means for clamping same to the vertical slide support, and means for adjusting same in a vertical plane.

8. A compound grinding head comprising two work supporting spindles, in combination with the horizontal table of the grinding machine and the rotating grinding wheel mounted thereon, a horizontal slide support for the tail stock, a vertical slide support mounted thereon, means for clamping same, means for adjusting same in a horizontal plane at right angles to the axis of the grinding wheel, a single spindle bearing block mounted thereon, .means for supporting same, a vertical adjusting screw with drive gear attached, and means for operating said screw. 7

9. A compound grinding head comprising two work supporting spindles, in combination with the work table of the grinding machine and the rotating grinding wheel mounted thereon, a horizontal slide support for the tail stock, a vertical slide support mounted thereon, means for making the horizontal adjustment thereof, a single bearing block for the lower spindle mounted on the vertical slide support, a vertical adjusting screw with drive gears attached, a horizontal adjusting shaft with gears attached, said gears meshing with the drive gears on the adjusting shafts of the head and tail stock bearings, means for operating said screws thus making the vertical adjustment for both the head and tail spindles simultaneous and uniform.

10. A compound grinding head with d0uble work supporting spindles, in combination with the horizontal table of the grinding machine and the rotating grinding wheel mounted thereon, means for supporting the tail stock, means for making a horizontal adjustment of same at right angles to the axis of the grinding Wheel, a vertical support block-for the tail stock bearing, a single spindle bearing block mounted thereon, means for clamping same, a secondary ad-' justable bearing block for the upper tail 1%) spindle mounted on top of the single bearing slide, means for clamping same to slide on lower bearing block, means for adjusting same in a horizontal plane to give a perfect alinement to both spindles.

In Witness whereof I, THEIS F. BERNARD, 15

sign these specifications.

THEISF. BERNARD. Witnesses: FREDERICK M, EHEHALT, MYRON J. DIKEMAN. 

